-
Magenta border and black screenGot my hands on a issue 3 48k machine. Did the initial resistance checks and everything seemed in order buy when I switch the machine on all I get is…
... continuity mode on a digital multimeter. Then if no faults are ... -
Opus Discovery "the big switch on" (after 20 years)I have a few of these Opus Discovery's with different Eproms in that have not been swiched for 15-20 years or so . I am in no rush to switch any on …
... does not help, use your multimeter on continuity (or a low ... -
Opus Discovery "the big switch on" (after 20 years)I have a few of these Opus Discovery's with different Eproms in that have not been swiched for 15-20 years or so . I am in no rush to switch any on …
... know . It is my "usual" multimeter question! Sorry).
It ... -
Opus Discovery "the big switch on" (after 20 years)I have a few of these Opus Discovery's with different Eproms in that have not been swiched for 15-20 years or so . I am in no rush to switch any on …
... the continuity buzzes from the Multimeter appeared weak or intermittent and ... -
ZX Spectrum issue 4B acquiredI recently acquired a ZX Spectrum with serial number 138-363292 on the case, and a 1983 issue 4B board I got it for the purpose of repair. and have…
... surprisingly tests ok with the multimeter O_o (sorry no pic, its ... -
Spectrum 48+ 4S - Upper RAM issue, and now a self-created problem!I recently picked up a known-flaky spectrum off eBay, to have a bit of fun fixing it and reliving youth. It was labelled as 'keyboard duff, shows…
... board tested fine with the multimeter, as far as the above ... -
help with my original issue 3b from when i was a teen. possible lower ram fault.hello, well ive tried to fix my old speccy, but haven't made much progress. could you help me out with some diagnosis. the fault occurred about…
... />
If you have a multimeter, check the DC supply voltages ... -
help with my original issue 3b from when i was a teen. possible lower ram fault.hello, well ive tried to fix my old speccy, but haven't made much progress. could you help me out with some diagnosis. the fault occurred about…
... have access to a digital multimeter?
The BASIC ROM ... -
help with my original issue 3b from when i was a teen. possible lower ram fault.hello, well ive tried to fix my old speccy, but haven't made much progress. could you help me out with some diagnosis. the fault occurred about…
I think ill buy some lower ram ics.
yes ive got a multimeter. I checked the voltages and they seem about right. ive recapped it when I removed the upper ram.
I might buy a spare rom just incase. -
Original Grey +2 Picture IssuesSo, I have my +2 connected to an old CRT TV, and the Speccy has been working fine. Decided to have a shift around, but once I moved the +2 i've lost…
Sounds like the internal +12v supply might have failed, if you have a multimeter check the voltage on pin 11 of the TEA2000 (IC2). If it's not reading close to 12v, you'll be looking to change transistors TR8 and TR9.
B -
Original Grey +2 Picture IssuesSo, I have my +2 connected to an old CRT TV, and the Speccy has been working fine. Decided to have a shift around, but once I moved the +2 i've lost…
... failed, if you have a multimeter check the voltage on pin ... -
ComCon interface with an auto-fire joystick is possible?I need a little advice on this one, please! I have a konix speedking, with two fire buttons and auto-fire switch. I can use it with the comcon int…
... looked and probed with a multimeter only to find that pin ... -
ComCon interface with an auto-fire joystick is possible?I need a little advice on this one, please! I have a konix speedking, with two fire buttons and auto-fire switch. I can use it with the comcon int…
... expert.
With a multimeter, try measuring the resistance between ... -
Upper memory not available in issue 2A friend send me his issue 2 Spectrum for diagnosis. It boots okay but for some reason won't load games over 16kB. He sent also a Smart Card with int…
... on the chip as the multimeter beeped. Don't know if ... -
Upper memory not available in issue 2A friend send me his issue 2 Spectrum for diagnosis. It boots okay but for some reason won't load games over 16kB. He sent also a Smart Card with int…
I did some more checking with the multimeter. Pin 11 on one of the 4164 sockets seems to have a short either to pin 12 or some of the other address lines, depending whether the mainboard is in its casing and the position of the moon. -
Upper memory not available in issue 2A friend send me his issue 2 Spectrum for diagnosis. It boots okay but for some reason won't load games over 16kB. He sent also a Smart Card with int…
... the pins beeped with the multimeter. On the other hand the ... -
Toastrack - faint monochrome displayHi all, I've got a Toastrack with a video issue on both RGB and RF. I get a faint monochrome screen: on one LCD display it is predominately white,…
... /> I've just ran the multimeter from the 12v on the ... -
Getting a +3 working again (keyboard & tape socket issues)So, as part of my Spectrum restoration project I will also try to tackle the problem child among my fleet, the +3. PROBLEM ONE: Ever since I firs…
... my trusty Gunson's pocket multimeter, presumably set to one of ... -
Getting a +3 working again (keyboard & tape socket issues)So, as part of my Spectrum restoration project I will also try to tackle the problem child among my fleet, the +3. PROBLEM ONE: Ever since I firs…
... be wired differently. A cheap multimeter is handy here using the ... -
Faulty ZX SPectrum 128k +2Hello. Iv just joined as I recently came across my old Spectrum from nearly 30 years ago :-0 In my Dads house. I played with this thing for Years. An…
@kPATm do you have a digital multimeter?
[b][i]Mark[/i][/b] -
Faulty ZX SPectrum 128k +2Hello. Iv just joined as I recently came across my old Spectrum from nearly 30 years ago :-0 In my Dads house. I played with this thing for Years. An…
... minded.
The digital multimeter (volts measurement, diode tester, resistance ... -
ZX Spectrum border and sound problemAfter recap stange problem with ZX Spectrum (issue 3b) with sound and border. See video at: https://drive.google.com/file/d/0BwhYHKW6xjI-aVdMcEY4ajVk…
... need to use a digital multimeter (set on resistance, Ohms range ... -
ZX81 Ram pack problemI got recently Sinclair 16k memory expansion for my ZX81, but for some reason it will not work. The computer itself is operating normally without hi…
... /> Do you have a digital multimeter?
[b][i]Mark ... -
ZX81 Ram pack problemI got recently Sinclair 16k memory expansion for my ZX81, but for some reason it will not work. The computer itself is operating normally without hi…
Thanks Mark, I will do that.
I have a cheap digital multimeter, barely used, but may be useful if you tell me exactly what to do. :) -
Kempston interface schematic: wrong IC?Hi! I'm trying to learn about the inner workings of the speccy, and I thought that building a kemspton interface would help me learn about things lik…
... the continuity checks with my multimeter and everything seems to be ... logic analyzer, only a decent multimeter and a very ghetto DIY ... -
Disabling the ROM without removing the whole thingHi! I've got my hands on a non-working issue 6a. I suspect the ROM may be bad, but other things may be faulty as well. I've read that in an otherwis…
... no change.
- The multimeter checks described in the JoulesperCoulomb ... TR4: on diode mode, the multimeter with the positive probe in ... -
Disabling the ROM without removing the whole thingHi! I've got my hands on a non-working issue 6a. I suspect the ROM may be bad, but other things may be faulty as well. I've read that in an otherwis…
... computer switched off, use a multimeter (switched to the resistance range ...
